Numbo is equipped with a RONIM tide-gauge since january 2005. The observatory is managed by the SHOM in partnership with the Government of New-Caledonia and the Institute of Research for the Development (IRD).

In 2000, the Universityof Hawaiiannounced its intention to abandon the management of its permanent tide gauge installed at Chaleix, due to the poor condition of the measuring instrument and its numerous breakdowns. Elsewhere, the moving of SHOM/BHNC from Chaleix to the DITTT site at Numbo made it tricky to maintain the permanent French observatory at Chaleix (close to the American tide gauge).

Consequently, SHOM proposed to New Caledonia (DITTT) to install an MCN at Numbo, on the DITTT site. The shelter was financed by ZoNeCo and built in 2003 by the DITTT.

The Numbo tide gauge entered service on 27 January 2005.

It consists of a Khrone BM100 radar and a Marelta acquisition unit.

The tide gauge has been transmitting its data in real-time via the Internet since 7 October 2010.